Diaphragm liquid pump NF 2.35
Troubleshooting
KNF Flodos AG BA_NF2-35_EN_02_164912
Translation of original Operating and Installation Instructions
17
9. Troubleshooting
➔
Disconnect the pump from the power supply before working on
the pump.
Pump does not work
Possible cause
Fault remedy
Pump not connected to power
supply
➔
Connect pump to power supply
Power supply is not switched on
➔
Switch on power supply
Thermal switch or pump elec-
tronics have tripped
➔
Disconnect pump from the mains
➔
Allow pump to cool
➔
Identify and eliminate cause of overheating/overload
Connections or hoses are
blocked
➔
Check connections and hoses
➔
Remove blockage
External valve is closed or filter
is clogged
➔
Check external valves and filters
Diaphragm, valve plates or
seals are worn
➔
Replace diaphragm, valve plates and seals
(see Chapter 8.2)
➔
Replace pump
Tab. 10
Pump is not priming
Possible cause
Fault remedy
Suction side of pump not con-
nected
➔
Connect the suction side of the pump
Liquid in the priming container is
too low
➔
Fill priming container
Hose connections are not leak-
tight
➔
Secure transition joints between hose and connections with
clamps or other clamping elements
System valve is closed or filter
is clogged
➔
Open system valve
➔
Clean filter
Pump head is filled with gas.
The system is unable to handle
the pressure on the pressure
side
➔
Reduce pressure at pressure side
Particles in the pump
➔
Clean the pump head (see Chapter 8.2)
The pump parts are not re-
sistant to the medium to be
pumped
➔
Replace the pump head with a compatible version
Incorrect interchange of pres-
sure and suction line connec-
tions
➔
Remove pressure and suction lines and re-connect correctly
Tab. 11
